@bsv/sdk/dist/esm/src/auth/utils/createNonce.js

BSV Blockchain Software Development Kit

import * as Utils from '../../primitives/utils.js';
import Random from '../../primitives/Random.js';
/**
 * Creates a nonce derived from a wallet
 * @param wallet
 * @param counterparty - The counterparty to the nonce creation. Defaults to 'self'.
 * @returns A random nonce derived with a wallet
 */
export async function createNonce(wallet, counterparty = 'self', originator) {
    // Generate 16 random bytes for the first half of the data
    const firstHalf = Random(16);
    // Create an sha256 HMAC
    const { hmac } = await wallet.createHmac({
        protocolID: [2, 'server hmac'],
        keyID: Utils.toUTF8(firstHalf),
        data: firstHalf,
        counterparty
    }, originator);
    // Concatenate firstHalf and secondHalf as the nonce bytes
    const nonceBytes = [...firstHalf, ...hmac];
    return Utils.toBase64(nonceBytes);
}
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